scholarly journals Production of Hydrogen-Rich Gas by Oxidative Steam Reforming of Dimethoxymethane over CuO-CeO2/γ-Al2O3 Catalyst

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3684
Author(s):  
Sukhe Badmaev ◽  
Vladimir Sobyanin
Keyword(s):  
Fuel Cell ◽  
Partial Oxidation ◽  
Steam Reforming ◽  
Comparative Studies ◽  
Catalytic Properties ◽  
Fixed Bed ◽  
Space Velocity ◽  
Fixed Bed Reactor ◽  
Production Of Hydrogen ◽  
Al2o3 Catalyst

The catalytic properties of CuO-CeO2 supported on alumina for the oxidative steam reforming (OSR) of dimethoxymethane (DMM) to hydrogen-rich gas in a tubular fixed bed reactor were studied. The CuO-CeO2/γ-Al2O3 catalyst provided complete DMM conversion and hydrogen productivity > 10 L h−1 gcat−1 at 280 °C, GHSV (gas hourly space velocity) = 15,000 h−1 and DMM:O2:H2O:N2 = 10:2.5:40:47.5 vol.%. Comparative studies showed that DMM OSR exceeded DMM steam reforming (SR) and DMM partial oxidation (PO) in terms of hydrogen productivity. Thus, the outcomes of lab-scale catalytic experiments show high promise of DMM oxidative steam reforming to produce hydrogen-rich gas for fuel cell feeding.

Production of Hydrogen from Ethanol Using Pt/Hydrotalcite Catalysts Stabilized with Tungsten Oxides

2012 ◽  
Vol 15 (3) ◽  
pp. 215-223 ◽  
Author(s):  
J.L. Contreras ◽  
M.A. Ortiz ◽  
R. Luna ◽  
G.A. Fuentes ◽  
M. Autié ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Steam Reforming ◽  
Fixed Bed ◽  
Thermal Stabilization ◽  
Fixed Bed Reactor ◽  
Ethanol Steam Reforming ◽  
Vis Spectroscopy ◽  
Production Of Hydrogen ◽  
Stabilization Effect ◽  
Ethanol Steam

An stabilization effect of WOx over the Pt/hydrotalcite catalysts to produce H2 by ethanol steam reforming at low concentration was studied. The catalysts were characterized by N2 physisorption, X-ray diffraction, Infrared (IR), and UV-vis spectroscopy. The catalytic tests were made in a fixed bed reactor. The catalysts showed porous with the shape of parallel layers with a monomodal mesoporous distribution. By IR spectroscopy it was found superficial chemical such as: -OH, H2O, Al-OH, Mg-OH, and CO32-. The reaction products were; H2, CO2, CH3CHO, CH4 and C2H4. These catalysts did not produce CO and showed low selectivity to C2H4. By XRD we found that catalysts having Pt and the lowest W concentration showed the highest crystallinity and the highest stability during the reaction of ethanol steam reforming. A possible thermal stabilization effect of W in the hydrotalcite crystal structure leading to prevent the Pt sintering is proposed. By IR the hydrotalcite hydroxil groups coordinated with Mg and Al decreased by the presence of WOx. We found that catalysts with low W concentration and Pt having high crystallinity showed the highest stability after ethanol steam reforming. It could be a possible thermal stabilization effect of W in the hydrotalcite crystal structure leading to prevent the Pt sintering.

Synthetic Technics of Methyl Acrylate through Aldol Condensation with a Multisubsection Fixed-Bed Reactor

2011 ◽  
Vol 233-235 ◽  
pp. 2859-2862 ◽  
Author(s):  
Tao Jing ◽  
Jing Zhi Tian ◽  
De Zhi Sun
Keyword(s):  
Methyl Acrylate ◽  
Conversion Rate ◽  
Methyl Acetate ◽  
Catalytic Properties ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Fixed Bed ◽  
Space Velocity ◽  
Fixed Bed Reactor ◽  
Ester Yield

Two types of catalysts, V2O5-P2O5/SiO2and Cs-Sb2O5/SiO2, were separately prepared with SiO2as carrier. Their catalytic properties were investigated in the process of synthesizing methyl acrylate through aldol condensation with methylal and methyl acetate, and the influence of the catalyst’s filling up technique on the reaction was studied. Reactions were performed in a fixed-bed reactor. The research results indicate that aldol condensation reaction is effectively promoted when the two catalysts were filled up in appropriate subsections of the reaction tube. Specifically, when V-Si-P Oxide was filled up at the 4thsubsection and Cs-Sb2O5/SiO2catalyst at the 6thsubsection with the temperature of the reactor at 400 °C and the mol ratio of methyl acetate and methylal at 1.6:1 and the space velocity at 3.2 h-1, then the conversion rate of methylal was 50.9%, the selectivity of methyl acrylate was 90.63%, and the ester yield of methyl acrylate was 46.15%.

Numerical study of sorption-enhanced methane steam reforming over Ni/Al2O3 catalyst in a fixed-bed reactor

2021 ◽  
Vol 165 ◽  
pp. 120635
Author(s):  
Amira Neni ◽  
Yacine Benguerba ◽  
Marco Balsamo ◽  
Alessandro Erto ◽  
Barbara Ernst ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Numerical Study ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Methane Steam Reforming ◽  
Methane Steam ◽  
Al2o3 Catalyst

Dimethyldisulphide Hydrodesulphurization on NiCoMo / Al2O3 Catalyst

2017 ◽  
Vol 68 (7) ◽  
pp. 1496-1500
Author(s):  
Rami Doukeh ◽  
Mihaela Bombos ◽  
Ancuta Trifoi ◽  
Minodora Pasare ◽  
Ionut Banu ◽  
...  
Keyword(s):  
Good Accuracy ◽  
Fixed Bed ◽  
Continuous System ◽  
Space Velocity ◽  
Molar Ratio ◽  
Catalytic Reactor ◽  
Liquid Hourly Space Velocity ◽  
Hydrodesulfurization Process ◽  
Al2o3 Catalyst ◽  
Simplified Kinetic Model

Hydrodesulphurization of dimethyldisulphide was performed on Ni-Co-Mo /�-Al2O3 catalyst. The catalyst was characterized by determining the adsorption isotherms, the pore size distribution and the acid strength. Experiments were carried out on a laboratory echipament in continuous system using a fixed bed catalytic reactor at 50-100�C, pressure from 10 barr to 50 barr, the liquid hourly space velocity from 1h-1 to 4h-1 and the molar ratio H2 / dimethyldisulphide 60/1. A simplified kinetic model based on the Langmuir�Hinshelwood theory, for the dimethyldisulphide hydrodesulfurization process of dimethyldisulphide has been proposed. The results show the good accuracy of the model.

CFD s tudy on partial oxidation of methane in fixed‐bed reactor

2019 ◽  
Vol 98 (3) ◽  
pp. 757-766
Author(s):  
Yonghui Li ◽  
Chao Lu ◽  
Xingxing Cao ◽  
Zhongfeng Geng ◽  
Minhua Zhang
Keyword(s):  
Partial Oxidation ◽  
Fixed Bed ◽  
Partial Oxidation Of Methane ◽  
Fixed Bed Reactor ◽  
Oxidation Of Methane

Hydrogen Production from Ethanol Steam Reforming: Fixed Bed Reactor Design

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Pablo Giunta ◽  
Norma Amadeo ◽  
Miguel Laborde
Keyword(s):  
Steam Reforming ◽  
Flow Model ◽  
Multicomponent Mixture ◽  
Plug Flow ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Ethanol Steam Reforming ◽  
Heterogeneous Model ◽  
Ethanol Steam ◽  
Hydrogen Stream

The aim of this work is to design an ethanol steam reformer to produce a hydrogen stream capable of feeding a 60 kW PEM fuel cell applying the plug flow model, considering the presence of the catalyst bed (heterogeneous model). The Dusty-Gas Model is employed for the catalyst, since it better predicts the fluxes of a multicomponent mixture. Moreover, this model has shown to be computationally more robust than the Fickian Model. A power law-type kinetics was used. Results showed that it is possible to carry out the ethanol steam reforming in a compact device (1.66 x 10 -5 to 5.27 x 10 -5 m3). It was also observed that this process is determined by heat transfer.

scholarly journals Effect of CO2 partial pressure on dry reforming of ethanol for hydrogen production

2018 ◽  
Vol 1 (1) ◽  
pp. 6-10
Author(s):  
Fahim Fayaz ◽  
Ahmad Ziad Sulaiman ◽  
Sharanjit Singh ◽  
Sweeta Akbari
Keyword(s):  
Partial Pressure ◽  
Fixed Bed ◽  
Dry Reforming ◽  
Fixed Bed Reactor ◽  
Bet Surface Area ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
Co2 Partial Pressure ◽  
Temperature Programmed ◽  
Al2o3 Catalyst

The effect of CO2 partial pressure on ethanol dry reforming was evaluated over 5%Ce-10%Co/Al2O3 catalyst at = PCO2 = 20-50 kPa, PC2H5OH = 20 kPa, reaction temperature of 973 K under atmospheric pressure. The catalyst was prepared by using impregnation method and tested in a fixed-bed reactor. X-ray diffraction measurements studied the formation of Co3O4, spinel CoAl2O4 and CeO2, phases on surface of 5%Ce-10%Co/Al2O3 catalyst. CeO2, CoO and Co3O4 oxides were obtained during temperature–programmed calcination. Ce-promoted 10%Co/Al2O3 catalyst possessed high BET surface area of 137.35 m2 g-1. C2H5OH and CO2 conversions was improved with increasing CO2 partial pressure from 20-50 kPa whilst the optimal selectivity of H2 and CO was achieved at 50 kPa.

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